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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748630fc9309ee5613c611ed27f7eb72ae298dd2c5b4a043cc79866ced250fe7' 
  AND token = 'aAT7hDXKCVIhhEchxw1NleIehfEzbmRsKtnX1DqzQhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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