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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ead406de68bb4a73da231d8f6cbd8f8517c7da584bacbb0169bb0af9450813b' 
  AND token = 'JjAT9A4e8sFSZK6YlnHmotc2OszF7knY2FevuzpF7OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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