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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fc0812d4410f6e248f8a9ad64670978cd32844c60a79c11bf27720feb36891' 
  AND token = 'lu4il44kk8C9TND4lEVsXtuX3949ZTXp/OjE3EsMZQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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