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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2905b71c8f5bfcdbf4766656088058c7cd3dc7a49d7462f66a484f2260eef5' 
  AND token = '/jKeA0rdMun03FFFmYTaHG1+tbNHtqHQG2PEPvJpGT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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