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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13d5c706ff3947dc5882fc5bc1f398daa3b0b116240f85c8497bb49ed8a8662' 
  AND token = 'r2UGH7jM9Bl3ptOZoPcXR6YlEAZxcnIjtClZEXNH4ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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