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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b959e21419895e3449f3318ebc1fe2473106c063b76a0f9bc232051c30e57956' 
  AND token = 'RlEMOqS0uq2uURmSv9q87mspEoEPkGEvdw7AoU1VlJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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