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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20faca049f7ef9a139ef923c3256eab2b42941de3406df52243edc29adf283ca' 
  AND token = 'lXsqliCPvV6DWhcGQLdQg3z6hMBQ6BIaCp4sFv+miWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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