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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c3d9ae40e8504d48e5944320e612ba438e6accdd23d019f9f56523ad6600eb' 
  AND token = 'hrvKug4IOm8M+gyFmxB5KKt9VSBvQrpeg3x8szXyKG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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