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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7a2094099a1179c5e9945cee4bb81dd6bc368be710674de2b25278ad74704b' 
  AND token = 'M/nFckD5wWau2JtPlbp0VrbBH0wMTOMX8Fd7f9AsbgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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