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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e310ff172c571c2086d84a5d5665940605a21fb05d8c6c4f0ef2e838a8863ccf' 
  AND token = 'g2ZcTrL66eY4LbDM6jXSAzpTy2Cmc0bt0gB5nuqpV9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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