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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22eb3bcf1a2efc80198f528df3b908bc3cb2f39eb007685abe01273853d2dce6' 
  AND token = 'SDqoz/1Iyc2RDo85YTWKynTUAudQXZVGz+qIDuW6nHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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