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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb29ee39aef1505173692c473ee7847781f659c37c9bcb2fc52807907ff1b2e' 
  AND token = 'T0nCHj2/+VKZu3OBiloKJlDoU28izbNnfALUbBpoRZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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