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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0176bf13acdd89313acd054eca67a7b1dfa03d49257bc6dd5cc8f20c36e17729' 
  AND token = 'ij7Hl565OCQR81Xzecc+bP3TG6ZdyS4xDNb14/r4TLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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