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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e55597aa726b069111431e8fb6352c6e0ba172656470c4dced2177d7a65ef06' 
  AND token = 'x7NxlKX8su/LipTHRrzektdNTAivlJxSIbnQFcoOuPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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