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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e6e615240e940599c1598834d19fb31d718fd01a86a0355957ba6d48c8efbc' 
  AND token = 'fDm+Zp7qzQz5g2A4ZEb8fH9S7pnxAwqbcM9ZYvcZx98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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