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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf93afd40097d30897e4109377a20564392833386cb6e093452f45902874d2c' 
  AND token = 'TJw4PVb7sX58kMcpiJJx4DLra/ON5oB/+TSuBawaSdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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