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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7b3c612df210901fb451c5bd81b980285204c7a3ed733797e0c8321150764c' 
  AND token = 'zB6CfosWgzgdg8K2USvuCb/lYcHfqrMz2I9DkNue51Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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