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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594487982e07bc40b8e62763b45820be42b0be858424c1b800d2d20f7582fda7' 
  AND token = 'J9hPzDI673o5wRRl5AN+XMXdTxb8EizEPYBYzBUTbHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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