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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb02ddf6a82a0f6720ea5ebb080818023bfa73ab289467ee6c220e523412df10' 
  AND token = 'w2RSvvaAv9i613q8VgztlH7QE/EtuoyHmgTgTpPo26o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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