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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6930938416eef685b514a5103fe8a207c2576e5ad9f34f4d5831b4af754b1886' 
  AND token = 'RjIJ8I2S/3dTf/keUYP0mCB7CBnWGIw/96StogyhPiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}