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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39c827706134ff31e914e89bb578f4383b36d05c90f943c9c18f4fef0f0ea99' 
  AND token = 'nF64r8pEkSM2j4bcD8/TqrLq5EQU/GnZQ08EoUglwEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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