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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fe789b33ae13ffbf2892ed391b357eac8e6908238464410eea8294a8091594' 
  AND token = '5jbLYzMbQroh+gircM+SlSNSd7rFcni0I+KxHsQSYU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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