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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a712809cb6d955f2f5fa5720e696e9a99ae678dc9182cb1dfed6222363b5ac1' 
  AND token = '+Mws6TIAgEacRSxY5+Pnge+H4NDYiB1iC2QJladAiRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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