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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383323769df81b01dc45be46c43c245afb0d465eb2e9abc0890028efe8afd6d2' 
  AND token = '3ZMttb5bVB1rsRpBPE/w4YV0iZGThTyMQlblmv9TbC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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