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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52a58dd60a6c657598f8fd2062e5cf547ad25cc78a48f3a389439570488e5b5' 
  AND token = 'mEfNdtKJ42BywzHQOWoZgcBeOYyqkIDsxMFPXodgy/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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