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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e17bc9041850f3bc7690069ea93d6b5dc9de31169c23ed275f90253e40ca0f' 
  AND token = '6oR/iFhmMtrF0QzKMcuta6jSlm6RCGxBq1Zhn4QyPoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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