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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d1bb7e27e25a027ba34c9c7ca962baf464ec35e4f393e97087c3deb0d115d8' 
  AND token = 'IzaHI6OtC1QI4FzZqshg3oVnLi6NIgCGJDncas+KQ48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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