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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12dbd05c82168fc2e7cee4b083cdbf6b0ab2d8d09d44ff18e2a86b0766f4887' 
  AND token = 'j3rQw0DxLbOFmtxB89h6UKwQCJGK9VXj50dbhYtBiCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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