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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4535853eea1b44b17aafebbe5d972484c1c3a6fa54cb7450304e32b1108b210f' 
  AND token = '1ni57D/VqF01kG/EXa9i4eONinBsSaiXyBLIpIi/Hqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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