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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c762a5022a19ceac43764478b9e005c79341ffb37eeafbd7c51294f796789c' 
  AND token = '3tgMq108tz2oHxGvfGtbBV1lS9/qdLGArpaQsiFu6pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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