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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbb9bb776cf3f396cee6f8e7a1adb66c19e2bf9cd0fdec520c42be3362b1bae' 
  AND token = 'wVOPgXGEN/BZJnz+onTX003LVU3pLdvlMlXUsI8rVVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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