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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9a78866f3341d8cc74a84d4a956b78e863827e0c6a48a63ef7adda069f9dde' 
  AND token = 'iki5nC/Om1CCS9zVEETqKfSc4U8qR+8TZILlgCKT+6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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