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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c775d96afce1b51c4d989a12f880efdc6f184c21acdaf06732d7dec72ffec4' 
  AND token = 'U2FhpSbPf+vqDcaZNIbZmI+K/QhU6HGgayj94bSMcAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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