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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2950614203ea980d53edc013f0b5f40482b54e3ad8c778fd4d3d1d50f6b521' 
  AND token = '9M35GAULIQF3gH1UBl5NcFn0GS2Dx/3G5pFQrsLUyuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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