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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173d2992598b55638ce00498c269e19611b3ddbd7ad383bf094ead74c2cd793c' 
  AND token = 'mC2yjm4iAWOD9/jrESE7wm69c4xj+/WO0+jPFzgzU4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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