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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0705e1dff2e12c27a3d8c2d616c2785c11e663669e912b82370ef3e88f6b6a' 
  AND token = 'l4tkcZV35HeBwawAuMG08E0qSnwkqW/Au7mCKwyAnho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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