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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e406d9d3f8ebfb3196587c886d5a13572f6f164880556765c8dd00160b2f50c' 
  AND token = 'AhBFD741F7TNo1O8k8St4i64TIBdvlG7WKgmsYBaMnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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