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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29920bb7251e5a62c5d1ebc8df0a31f8168983490e1b666ac1be8b51047d29b2' 
  AND token = 'tsg7Q0yxT92Qh/I1ITaitr7mFKjHxqAv9IwKR+P41lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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