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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b40727124f52c85b4ba0c1cdf993f96493ab35e7b4d8c55f8580479e0a03cc' 
  AND token = 'lG4ERwjfBzgY/CSE+zauTI/nL57xBWEbgPbIuNf3/Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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