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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0537940eeb9f5bed231123a7f6efbd6bfe8d01be498102e36dd8239bf54b69ae' 
  AND token = 'GYQIVciVIoBVJ8t0u5zxjdLX0+kWrk8eecSUg52+Z9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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