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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27541cb7ed4a532d5e814567e4eeab2f516d4c200fa700bb2294c59ec4562a71' 
  AND token = '56PoiP6QApq+DKD/IjmfgIdptos2dHcH5PyPa8+I+1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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