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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1546c85686c3cf07385062ffe2bc61e1185753262d0e6705983ad75a2fa57f' 
  AND token = 'cdFsxaii8g3K0dqhJq7Yve4Dve10XPr3pVz8tOjjuzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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