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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ed2cd93fe80281e0dedc1f117bcb29e1389157689d1c7c888911907fb25a89' 
  AND token = 'cA/+7kPv+DOfPuIPlmKt5TMBJDVqv4ZJX+k7jPgekCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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