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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7341d473bba992968bcbebe2c79deac328d01e736e29e158c3374521f66413a' 
  AND token = '1Ehe4dMRz6w/EfnB8wH4vhQFPgmkhYF9KIutgWH00AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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