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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a5c496c8d8a4b1479e8ec330ea59b5fbb9a20057931646c1c4603b1cf5bd8e' 
  AND token = 'fopjOk4mWa8Oy1vmUJK0IbVq0kFQGbyb2O8BJVSKcEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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