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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136b2db229493c7295e8a4cb2cf1bdb0f8d3dc75c362727f221de01ed2bc6959' 
  AND token = '4nAhBRC0v2oQIBONWSQmPRVBH25o5lr9EXP4C7xWclM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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