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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8627982f87597d2e2b9d7257fefd7cc8e6312e5bf443776e439a0d7e0f39998e' 
  AND token = '8nOkSk/Y+ouOkckuwU4VYkkZze6vZ+4cFahvsMxe+zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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