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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e40308a629e55c3d30fd621166476e40124e337ec2d184e2bf1c36caf4cc34d' 
  AND token = 'SB4fkQFk8YP0fXMlmfmZSgBRc2DPSBOur6dzFmze0ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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