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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e0244c7ac4b050feab95a4d6c1f3da862cc1affe8e357b8f33508a66d761c3' 
  AND token = 'p07VvHXP0B7kAnE8a6pFO3uWiWYz/0sgJM+fET0lPO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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