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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1313628888409c8b0fef7b8f07930d992ca342fffc326fd6405ac91d3f787bc4' 
  AND token = 'r6COxL4KmvU0cR9C2fusIWaJmnqUhQfVrbLx+nW9ojI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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