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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f5d08b09632861c8c4639c2a711519cdec0854454c122e79ccf6e3c66548b8' 
  AND token = 'wK6sbbU1WANtiejyDLcQP86q/BJEx2RlCRVDSVTKqzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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