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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b25c2410ed2a2e191256c51b6b2952a62824676f8deed338ca64ae94b4f1a6' 
  AND token = 'J318+V5hxV4SXTcgN31sE1qw0T1Wu9LRbQmDem+LDJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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