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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0add919de8c9ed36512e6bee0653a510604282e3409da42dc13293bf8d520783' 
  AND token = 'LMIZUr0kMM84wYwHWtyDkpF0ImYLMl9pyywhJZyeoyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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