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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a68cbee6232e22815fbe048876388b1f231e79e11eeeede6696faa759fedb9e' 
  AND token = 'UDRm2cXr871YPIbkDOlx9CKSUd3Xn4Z72iEDN5yVSLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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