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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d97f085e5eebf053731c338a84f9aa616a476f0e549c060a6929a844c8838ea' 
  AND token = 'v62tDiRVdLfcDer4cg9rYZRuJ6Hi/adR+KkZFiEnoGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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