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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26865ab0f9c99813ad2beafda73f1bfa2cac0631cbb2aa15de345efe2781dfb' 
  AND token = 'pa9fOfriv+O6JgNnd5vA4yR7hmDw+2mPv0LxfDDpV6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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