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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f852526d4c6275787e575e78e7a912ede663f8fd911d8e3af9c65d44ecca86' 
  AND token = 'ewEBU6ldJKecMtQLSopkJZVYJmCL4An2HJu89MS/gDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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