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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbffcb29daee5ff20c626c4f52ee85e8e6aba33f13e72efe5b5a12b3a5430d79' 
  AND token = 'EsahphBIRsuMPWIUbjAf0SQnSaJpuUn/IWSEX/GReJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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