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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebd7be80e2234ed7b22d99e7fa3913c94185e55d4b71d2ac37495b781f045b6' 
  AND token = 'l2c34jgxgwqtLDeYVXZkhuK4Ag2bABgdB/5NqSOrmk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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