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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b68b5b4463a394849f0f0fb719c56ecb0147fcc56b3dded51c636545f186665' 
  AND token = 'Dt+ucV/6alt68/2jvN6VssZ0zXcadbMVZ7zI22Szkbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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