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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e5ce104a0dc4f5250d72f8e13deda7bb04083f400ec4c9d126c21de866322a' 
  AND token = 'SzMtMZjzHqy1eraIdWk2xEoukmbuzqUeEs3qObb5/Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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