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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1af5e78a7ce8a608727cdcff6760e3858d9fe32ac0a7afebc8b577f4968f37' 
  AND token = 'slV2GMPf6HyhtNUx7x0VakkuEqSCkIb/uXDR+pi6j84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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