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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdba37a38554fe802f9c3bb59ab4dc2849f7fa04018a90d6f8e413f753181c44' 
  AND token = 'rlW6kU9E2TP8lPsmx69QOG31uzqifDOGXUtSPk47dj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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