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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab8ea98fed4c1508571ea9dc541625b9eef86b182b7f4eec5178c78d1240dec' 
  AND token = 'l6eE9cJ/n328WUO2A+aqJ0zPbtpdN7DesgeJY6rAExo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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